Riser manifold



FIG. 1 is a front, perspective view of a riser manifold showing my new design;

FIG. 2 is rear perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a front side elevational view thereof; and,

FIG. 8 is a rear side elevational view thereof.

The broken lines shown in the figures are included for the purpose of illustrating portions of the riser manifold and form no part of the claimed design. 

CLAIM The ornamental design for a riser manifold, as shown and described. 